AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
Guru3D - Guru of 3D: PC Hardware Reviews and tests
Prime95 - Prime95 is a program that searches for new Mersenne prime numbers.
Geforce Experience - GeForce Experience is a new application from NVIDIA that optimizes your PC in two key ways.